其主体是一个表达式。
The above regular expression is looking for an h1 tag and all of its contents.
上面的正则表达式匹配h 1标签以及标签内的所有内容。
A condition is an expression that is evaluated so that its result can be tested.
条件是一个可求值的表达式，所以可以测试其结果。
The dynamic type of an rvalue expression is its static type.
一个右值表达式的动态类型，就是它的静态类型。
The code examples show an example template expression, with its result on the next line.
下面的例子展示了一个模板表达式的示例，结果在第二行。
Tissue microarray is an efficient technique to study genes and its expression product.
组织芯片技术是高效的研究基因及其表达产物的技术平台。
You cannot call it by using its name in an expression.
不能在表达式中使用其名称来调用它。
You cannot call it by using its name in an expression.
不能在表达式中使用其名称来调用它。
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